Journal Article

Newly discovered Wolf–Rayet and weak emission-line central stars of planetary nebulae

K. DePew, Q. A. Parker, B. Miszalski, O. De Marco, D. J. Frew, A. Acker, A. V. Kovacevic and R. G. Sharp

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 414, issue 4, pages 2812-2827
Published in print July 2011 | ISSN: 0035-8711
Published online July 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.18337.x
Newly discovered Wolf–Rayet and weak emission-line central stars of planetary nebulae

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We present the spectra of 32 previously unpublished confirmed and candidate Wolf–Rayet ([WR]) and weak emission-line (WELS) central stars of planetary nebulae (CSPNe). 18 stars have been discovered in the Macquarie/AAO/Strasbourg Hα (MASH) PN survey sample, and we have also uncovered 14 confirmed and candidate [WR]s and WELS among the CSPNe of previously known PNe. Spectral classifications have been undertaken using both Acker & Neiner and Crowther, De Marco & Barlow schemes. 22 members in this sample are identified as probable [WR]s; the remaining 10 appear to be WELS. Observations undertaken as part of the MASH spectroscopic survey have now increased the number of known [WR]s by ∼30 per cent. This will permit a better analysis of [WR] subclass distribution, metallicity effects and evolutionary sequences in these uncommon objects.

Keywords: stars: Wolf–Rayet; planetary nebulae: general

Journal Article.  8904 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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